Fire pot



F. L. LINDHORST.

FIRE POT.

APPLICATION FILED NOV. 16. I921.

3 SHEETSSHEET l.

K) 1 M W Z l l p M :4

" v V W} INVENTOR.

v I y c 4 & w w"? ATTORNEY.

F.L. LINDHORST.

FIRE POT.

APPLICATION FILED Nov. 16. 4921.

1,428,790. PatentedSept. 12, 1922.

3 SHEETSSHEET 2.

IN VEN TOR.

ATTORNEY.

F L. LINDHORST.

FIRE POT.

APPLICATION FILED NOV-16,1921.

1 ,428, 7 9 0 Patented Sept. 12, 1922.

3 SHEETS-SHEET 3.

INVENTOR.

ATTORN Y.

Patented Sept. 12, 1922.

UNITED STATES PATENT or rice,

FREDERICK L. LINDHORST, OF DETROIT, MICHIGAN, ASSIGNOR =TO DETROIT TORCH & MANUFACTURING COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

FIRE roar.

Application filed November 16, 1921. .iSerial No. 515,500.

To all whom it mag concern:

Be it known't'hat I, FREDERICK L. LIND' HORST, a citizen of the United States, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new and useful Improvements in Fire Pots, of which the following is a specification.

This invention relates to fire-pots and has for its object an improved fire pot which is provided with an improved'arrangement for preheating the'fuel'oil and concentrating the flame. The same is also providedwith an improved grid whereby the burner may be easily disassembled from the other parts. These'and other features will be described in the specification following.

In the drawings,-'

Fig. l is a side elevation of the fire-pot showing a part ofthe tank broken away.

Fig. 2 is a top plan view of the fire-pot with the shield in place.

Fig. 3 is a section on the line 3-3 of Fig. 2, showing a part of the shield.

Fig. 4 is a cross section onthe line 4- -4 of Fig. 1. i

Fig. 5 is a view largely invertical section of what I call the chimney andwhat is ordinarily calledthe-coil cup.

a designates the fuel tank providedwith the usual air pump Z). This fuel'tank has the bottom provided with-an annular flange which engages in and is soldered to the beaded flange of the side walls of the tank. At spaced intervals along the two flanges are heavy gauge metal clips 0. as wear pieces and are simply strips of .heavy gauge metal that double over the bead v formed by the turning of the outer flange over the inner'flange as at (Z.

Three long studs or posts 6 are threaded at opposite ends and form supports for the usual burner grid f. This grid is provided with-three integrally cast ribs 9 on which is to set the vessel in which is contained the substance-to be melted. The grid is These act seatedon'the outside of the ribs 9 in the customary way so as to protect workmen from splattering of the substancein the vessay in which a is being melted.

Heretofore' it has been customary to use a coil of tubing in this chimney and hence this chimney has ordinarily been called a coil cup. A burner such as designated m has been used at the lower end of thelcoil and has been provided with the usual small fuel orifices nthat allows the pressure to project the fuel oil up against the coil. If the flame does not strike directly against some part of the coil the burner will not operatesatisfactorily as the necessary preheating of the fuel oil will not be secured.

' of fine wires or similar material is secured in the tubing before it is bent to form a filter for the fuel oil. Obviously after this tubing is so filled withthe fine wires and is bent'in. a number of convolutions, it is impossible to remove these wires in case of obstruction. Hence the filter cannot be cleaned. It is the objectof my invention to provide a preheating run of tubing of such a character that the wires may be easily drawn out and cleaned when necessary.

To this end instead of connecting the usual coil of tubing to the elbow 0,1 provide a short run of tubing which has a sort of bulging elbow or C run at the elbow. The wholepreheatingtube might be said to resemble, roughly, an interrogation mark. This C portion of the preheating tube is carried out into the axis of the burner barrel or tube. 7). This is a tube very, similar to the burner barrel of an ordinary blow torch. It is provided with air admitting holes and at the lower end is provided with a mouth into which is directed the stream of fuel; oil from the burner. The upper end of the barrel tapers to concentrate the flame in much the same way as the blow pipe burner shell tapers. However,the barrel when cast is provided with two features not found in the ordinary blow pipe burner shell, namely, a

tube is an ordinary form of burner for fire- I pots and is simply a closed end short tube 712 with an orifice a. This burner screws into the elbow t and it may be taken out by.

unscrewing to permit the preheating memher to be removed from the chimney.

It will readily be seen that with only the half convolution contained in this preheatingtube itwill be easy enough to draw out and replace a mass of filtering wires which cannot be done with the ordinary curled p reheatingtubing. The C portion of the shaped preheating tube projects out into the axis of the burner shell and directly above the oil orifice n through which the oil is projected under considerable pressure. up against the elbow to properly preheat the oil tosecure the steady combustion which is necessary 'for successful operation. Furtherinore, the useof theburner shell which a'c'ts both as a mixing chamber andcombustion chamber very materially aids in consist,- eiit and steady operation. The upper portionfof the tapering burner shell is the combustion chamber-j The lower portion is the mixing chamber where the air mixes with the 011 issuing from the orifice n. With the elbow of the shaped tube coming directly out into the axis of the combustlon chamber proper preheating is always assured and a steady flamewill bethereby secured, Furthermore, the products of combustion are all concentrated toward the center of the grid so .as notto be uselessly dispersed at the sides. .y

Still another feature is the arrangement to secure ease'of disassembly. The grid is solid forabout three-quarters of the way around and for the other quarter it has a hinged section a, shown in dotted lines in the outer position in Fig. 2. By unscrewing the union nut c that connects the oil pipe w with the valve coupling m and by swinging out the hinged grid section,,it is possible to lift the preheating tube and thevertical oil pipe and the connecting elbow directly out of the chimney z, Of course, the burner W. has to first be unscrewed. This swinging section has a portion y that is offset lower than the main portion of. the segment and is pivoted onvone of the posts 6. The other endiof thesegment has a section a ofi'set on a lower plane and is adapted to hook over the otherpost. when the clamping nut 1 is a separateand detachable preliminary heat- 7 ing tube supported in the burner shell, and a burner supported below the burner shell and arranged to project fuel oil into the burner shell. I r

2. In a fire-pot, the combination of a grid, a chimney supported below the grid, a preliminary heating tube supported in the chimney, a separate burner shell supported upon the said tube and arranged to concentratethe' flame upon a portion of the tube which runs along the center of the shell, and a burner supported by the tube below the burner shell and arranged to project fuel oil up into the burner shell. I

3..In "a fire-pot, the combination of a grid, a preliminary heating tube supported below the grid, a separate burner shell supported by the preliminary heating tube below the grid and arranged to concentrate the flame upon a portion of thetube, and'a burner supported below. the burner shell and arranged todirect a stream of fuel oil up into the burner shell.

4. In a fire-pot, the combination of a grid, a burner shell providedwith a lip extending laterally at its upper end, a preliminary V i heating tube supported upon said lip and having a part running into the center ofthe shell, and a burner. supported on the lower end of the tube and arranged to direct a stream of fuel up into the burner shell.

5. In a fire-pot, the combination of a grid, a preliminary heating tube supported under the grid, a burner shell provided with a laterally-extending lip at its upper end vfor supporting the preliminary heating tube and provided with a dented-out side portion, said preliminary heating tube having. a C shaped convolution running into the ,cen-,

ter of the burner shell and then running into the dented-out portion of the side walls of the shell, and a burner supported on the lower end of the tube and having an orifice directing a streamof fuel oil upinto the burner shell.

6. In,- afire-pot, the combination of a grid, a preliminary heating tube having a portion formed into a E shaped run of tubing, a burner shell supported about such run of tube, and a burner arranged below the shell and arranged to direct a stream of fuel oil upintothe shell.

7. In a fire-pot, the combination of a grid, a preliminary heating tube having-a shaped run oftubing a perforatedburner v shell supported by such run of tubing about the same, and a burner supported on the lower end of such 5 shaped run of tubing and arranged to project a stream of fuel oil into the burner shell against the convoluted portion of the shaped run of tubing.

8. In a fire-pot, the combination of a grid, a preliminary heating tube supported below the grid and having a portion shaped into a shaped run of tubing a perforated burner shell having a laterally-extended lip and means for clamping the lip to the upper end of the shaped run of tubing, and a burner supported on the lower end of the P shaped run of tube and arranged to project a stream of fuel oil up against the shell and against the convoluted portion of the shaped run of tubing.

9. In a fire-pot, the combination of a grid, a preliminary heating tube supported below the grid and having a portion arranged in a shaped run of tubing, a perforated burner shell having a laterally-extending lip arranged to seat upon the upper portion of the E shaped run of tubing and having an out-dented side arranged to seat the lower run of the shaped run of tubing, and a burner secured to the lower end of the said run of tubing and arranged to direct a stream of fuel oil up against the convoluted portion of the shaped run of tubing.

10. In a fire-pot, the combination of a ring-like grid having a stationary section and a hinged section, a tank, a plurality of posts for supporting the stationary grid section upon the tank, the hinged section having a downwardly offset portion pivotally supported upon one of the posts and a second downwardly offset portion at the free end with a hook-like arrangement for swinging over the adjacent post, a nut on such post for tightening up against the hook portion of the swinging grid section, and an oil pipe and preliminary heating tube having a detachable coupling arrangement with the tank and which can be lifted out of the grid when the hinging section is open.

In testimony whereof I aflix my signature.

FREDERICK L. LINDHORST. 

